CN105610752A - Doppler compensation method for high-speed rail or aircraft VSAT broadband satellite communication - Google Patents
Doppler compensation method for high-speed rail or aircraft VSAT broadband satellite communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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Abstract
The invention discloses a Doppler compensation method for high-speed rail or aircraft VSAT broadband satellite communication. A server or an embedded system independent of a VSAT broadband satellite communication terminal is connected with the VSAT broadband satellite communication terminal and a GPS receiver or a Beidou receiver; software is operated by the server or the embedded system; Doppler frequencies generated by the high-speed rail or aircraft VSAT broadband satellite communication are calculated in real time according to the longitude, latitude and height data of a GPS or a Beidou navigator; the Doppler frequencies are supplied to the VSAT broadband satellite communication terminal in real time; the Doppler effect is dynamically compensated; therefore the existing non-high speed VSAT broadband satellite communication terminal can be applied to the broadband satellite communication of a two-dimensional or three-dimensional high-speed motioning rail or aircraft; any modification of software and hardware is unnecessary; the economic benefits are clear; and the technical risk is relatively low.
Description
Technical field
The invention belongs to VSAT wideband satellite communication field, particularly relate to a kind of for high ferro or aircraftOn the Doppler effect correction side of VSAT wideband satellite communication of frequency division-time division multiple acess (FD-TDMA) modeMethod.
Background technology
With respect to traditional single channel per carrier (SCPC) satellite communication, the VSAT broadband of main flow is defended at presentStar communication adopts frequency division-time division multiple acess (FD-TDMA) mode more, realizes multiplexing to the height of satellite bandwidthProperty. Time division multiple acess (TDMA) communication mode has high requirement for the time synchronized at communication two ends.
In recent years, VSAT wideband satellite communication has been widely used in moving communicating field, for example TVRelay, emergency communication, disaster prevention and control etc. These application are mainly to utilize automobile as carrier, will moveIn logical satellite antenna be arranged on automobile top, in motor racing, automatically adjust angle by antenna, rightSatelloid, communicates. According to the regulation of International Telecommunication Association, conventional time division multiple acess (TDMA) communicationMode can adapt to speed per hour situation of (non-high speed) below 120 kms, therefore moving for automobile inCommunication satellite communication, adopts conventional (non-high speed) VSAT wideband satellite communication just can realize stable logicalLetter. But, in the time that the speed per hour of means of transport exceedes 120 kms (at a high speed), adopt conventional VSATWideband satellite communication can run into a series of special technical barriers.
Wherein, keep satellite communication stable in high-speed motion process, one of technical barrier running into justTo overcome Doppler effect. In the time of satellite communication terminal high-speed motion, the satellite of its reception and transmissionThe frequency of signal can distort, and is called Doppler effect. Doppler effect can cause communicating by letter unstable,Even interrupt. Therefore exceeding the GSM of 120 kms for speed per hour must be to Doppler effectCarry out dynamic compensation, guarantee communication is normal. Particularly when high-speed motion develops into from two-dimensional spaceWhen three dimensions (aircraft), three-dimensional high-speed motion (aircraft) is than the height of two-dimensional spaceSpeed motion (high ferro) causes the origin cause of formation of Doppler effect more complicated, the shadow of Doppler effect to communicationRing also more remarkable.
At present, the conventional method that Doppler effect is carried out to dynamic compensation is the mode that adopts hardware,Utilize frequency synthesizer and frequency counter to measure the actual Doppler frequency occurring, it is mendedRepay. But the dynamic compensation method of this employing hardware involves great expense and less stable. Due to current generationIn boundary, the VSAT wideband satellite communication system of main flow is not for the Environment Design of high-speed motion, because ofIf this by this hardware Doppler dynamic compensation method for existing VSAT wideband satellite communication isSystem, need to carry out large-scale redevelopment to the hardware of existing VSAT wideband satellite communication system, and ifFor the VSAT wideband satellite communication system of the applied environment design specialized of high-speed motion, need to drop intoHuge R&D costs and operating cost.
Summary of the invention
The object of the invention is to, provide a kind of new for high ferro or aircraft VSAT wideband satellite communicationDoppler Compensation Method, technical problem to be solved be adopt modular design philosophy, pass throughBe independent of server or embedded system outside VSAT wideband satellite communication terminal, coordinate GPS or northThe data of bucket navigation, according to the longitude of the high ferro of real-time input or aircraft, latitude and three data of heightCarry out the calculating of Doppler frequency, and the Doppler frequency calculating is offered to VSAT broadband in real timeSatellite communication terminal, owing to being the outside Doppler effect correction side that adopts software dynamic calculation Doppler frequencyMethod, does not therefore need existing non-high speed VSAT wideband satellite communication terminal to do any hardware and softwareChange, just can effectively utilize existing non-high speed VSAT wideband satellite communication system realize high ferro orThe wideband satellite communication of aircraft, have obvious economic benefit, and technical risk is lower.
The object of the invention to solve the technical problems realizes by the following technical solutions. FoundationA kind of Doppler Compensation Method for high ferro or aircraft VSAT wideband satellite communication that the present invention proposes,That VSAT wideband satellite communication terminal is connected with server or embedded system, by GPS receiver orBeidou receiver is connected with server or embedded system, below server or embedded system are carried outStep:
Obtain longitude, latitude and the height of k moment high ferro or aircraft from GPS receiver or Beidou receiverDegrees of data;
While calculating high ferro or aircraft k according to the longitude of high ferro or aircraft, latitude and altitude information, be engraved in groundThe coordinate X of heart coordinate systemak、YakAnd Zak；
While calculating telecommunication satellite k, be engraved in the coordinate X of geocentric coordinate systemsk、YskAnd Zsk；
Coordinate X according to k moment high ferro or aircraft at geocentric coordinate systemak、YakAnd ZakExist with telecommunication satelliteThe coordinate X of geocentric coordinate systemsk、YskAnd ZskCalculate k moment high ferro or the aircraft radius vector to telecommunication satelliteRk；
Utilize calculus of finite differences, the radius vector R according to k moment high ferro or aircraft to telecommunication satellitekCalculate the k momentThe radial velocity V of high ferro or the relative telecommunication satellite of aircraft;
Through type (1-1) calculates the Doppler frequency Fd in k moment:
Fd＝(V/C)Fo(1-1)
Wherein, C is the light velocity, and Fo is signal center frequency; And
The Doppler frequency Fd in k moment is delivered to VSAT wideband satellite communication terminal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The aforesaid Doppler Compensation Method for high ferro or aircraft VSAT wideband satellite communication, Qi ZhongObtain longitude, latitude and the high number of degrees of k moment high ferro or aircraft from GPS receiver or Beidou receiverAlso comprise according to rear:
The navigation data obtaining from GPS receiver or Beidou receiver is carried out to dynamic analysis and filtering,Wherein filtering is the method that adopts clean cut system Kalman filtering.
The aforesaid Doppler Compensation Method for high ferro or aircraft VSAT wideband satellite communication, whereinVSAT wideband satellite communication terminal sends the satellite communication main website that channel receives in real time via satelliteDynamic frequency offset data send server or embedded system to, as calibration and the effect of Doppler effect correctionAssessment.
The aforesaid Doppler Compensation Method for high ferro or aircraft VSAT wideband satellite communication, wherein adoptsWith the timestamp in GPS receiver or Beidou receiver data as timing tool.
The aforesaid Doppler Compensation Method for high ferro or aircraft VSAT wideband satellite communication, whereinVSAT wideband satellite communication terminal is the LAN port that is connected to server or embedded system, GPSReceiver or Beidou receiver are the serial ports that is connected to server or embedded system.
The general method of calculating Doppler frequency is first to calculate the speed of aircraft or high ferro, then by speedVector projects to the radial velocity of satellite direction vector acquisition aircraft or the relative satellite of high ferro, then basisThis radial velocity calculates Doppler frequency. The method of this calculating Doppler frequency to use aircraft orThe speed of high ferro, the course angle of aircraft, aircraft or high ferro are for the azimuth of satellite, and aircraft pairIn parameters such as the angles of pitch of satellite. These parameters are derived data, in the time that measuring intervals of TIME is very little,Very easily be subject to the pollution of errors in position measurement, make the data such as angle, speed unstable, simultaneously actual flyingMachine flies and high ferro service data also shows, irrational jumping very easily occurs for angle-data and speed dataMoving.
Doppler Compensation Method of the present invention utilizes longitude, latitude, height three numbers of high ferro or aircraftAccording to the calculating of carrying out Doppler frequency, the course angle, azimuth, speed etc. of GPS are avoided using noStablize data, as shown in Figure 2, its Mathematical Modeling is: the longitude, latitude and the height that a) first utilize GPSDegrees of data calculates the radius vector of aircraft at geocentric coordinate systemB) calculate again telecommunication satellite at geocentric coordinatesThe radius vector of systemC) then according to vectorWithCalculate the radius vector of aircraft to telecommunication satelliteD) utilize afterwards difference method, according to radius vectorCalculate the radial velocity V of the relative telecommunication satellite of aircraft;E) finally calculate Doppler frequency shift FD according to radial velocity V again.
Because aircraft and high ferro have strict requirement for equipment volume and weight, therefore require to be responsible for meterCalculate server or the embedded system of Doppler frequency and want small and exquisite nimble, meanwhile, high-speed motion is for manyGeneral real-time of strangling frequency has very high requirement, and this just requires the calculating of Doppler frequency ease in useMathematical Modeling, avoid trigonometric function operation as far as possible, avoid big data quantity storage. From of the present inventionState Mathematical Modeling known: Doppler Compensation Method of the present invention is controlled at calculating the triangle of limited number of timesWithin functional operation and arithmetic, calculating is completed at Millisecond, therefore go for fortune at a high speedMoving real-time system, and lower to hardware requirement.
In time division multiple acess (TDMA) communication mode, satellite communication main website in real time instrumented satellite is logicalThe skew of letter terminal tranmitting frequency, although this frequency shift (FS) comprises multi-frequency component, stillCan be used as a kind of calibration of Doppler effect correction. Therefore the present invention also measures satellite communication main website in real timeFrequency deviation data via satellite channel offer VSAT wideband satellite communication terminal, Doppler frequency is enteredMobile state calibration, as the feedback to Doppler effect correction, correction and supplementary. For this reason, the present invention is defendingStar communication main station is embedded in a small and exquisite acquisition software, the each VSAT wideband satellite communication of dynamic acquisitionThe frequency shift (FS) of terminal, with UDP mode via satellite channel be real-time transmitted to VSAT wideband satellite communicationTerminal, then send external server or embedded system to by VSAT wideband satellite communication terminal, fromAnd the dynamic frequency sending according to satellite communication main website is offset, can assess the effect of Doppler effect correction.For example say, change to 3000Hz if the present invention calculates Doppler frequency from 2000Hz, and satelliteThe frequency shift (FS) that communication main station detects is constant all the time, illustrates that VSAT wideband satellite communication terminal occursExtremely, need prompting to report to the police. Because this function is in external server or embedded system insideComplete, therefore without VSAT wideband satellite communication terminal is changed.
Because method of the present invention has higher requirement to timekeeping system, in order to reduce costs, avoid makingBy expensive hardware timekeeping system, the present invention adopts GPS receiver or Beidou receiver data dexterouslyIn timestamp as timing tool, this design both can ensure accuracy of timekeeping, had avoided again extraHardware costs.
The present invention compared with prior art has obvious advantage and beneficial effect. By above-mentioned technical sideCase, the present invention at least has for the Doppler Compensation Method of high ferro or aircraft VSAT wideband satellite communicationFollowing advantages and beneficial effect: the present invention adopts modular design philosophy, wide by being independent of VSATWith the server outside satellite communication terminal or embedded system, coordinate GPS or the Big Dipper to navigateHow general data, carry out according to the longitude of the high ferro of real-time input or aircraft, latitude and three data of heightStrangle the calculating of frequency, and Doppler frequency is offered to VSAT wideband satellite communication terminal in real time, due toBe the outside Doppler Compensation Method that adopts software dynamic calculation Doppler frequency, therefore do not need existingThe non-high speed VSAT wideband satellite communication terminal having is done the change of any hardware and software, just can be effectiveUtilize existing non-high speed VSAT wideband satellite communication system to realize high ferro or aircraft wideband satellite communication,There is obvious economic benefit, and technical risk is lower.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, of the present invention in order to better understandTechnological means, and can being implemented according to the content of description, and for allow of the present invention above-mentioned andOther objects, feature and advantage can become apparent, below especially exemplified by preferred embodiment, and coordinate attachedFigure, is described in detail as follows.
Brief description of the drawings
Fig. 1 is a kind of Doppler effect correction side for high ferro or aircraft VSAT wideband satellite communication of the present inventionThe flow chart of steps of method.
Fig. 2 is the signal at WGS-84 geocentric coordinate system of the aircraft of a preferred embodiment of the present invention and satelliteFigure.
Fig. 3 is the schematic diagram that the present invention tests its all experiments were data of a demonstration.
Detailed description of the invention
Technological means and the merit taked for reaching predetermined goal of the invention for further setting forth the present inventionEffect, below in conjunction with accompanying drawing and preferred embodiment, to according to the present invention propose for high ferro or aircraft VSATIts detailed description of the invention of the Doppler Compensation Method of wideband satellite communication, method, step, feature andEffect, is described in detail as follows.
The present invention utilizes the server or the embedded system that are independent of VSAT wideband satellite communication exterior of terminalSystem, is connected with VSAT wideband satellite communication terminal and GPS receiver or Beidou receiver respectively, by takingBusiness device or operation for embedded system software, according to the data of GPS or Big Dipper navigation calculate in real time high ferro orThe Doppler frequency that aircraft VSAT wideband satellite communication produces, and Doppler frequency is offered in real timeVSAT wideband satellite communication terminal, carries out dynamic compensation to Doppler effect, thereby makes existing non-High speed VSAT wideband satellite communication terminal can be for the high ferro of two dimension or three-dimensional high-speed motion or aircraftWideband satellite communication.
Refer to shown in Fig. 1, wherein, server or embedded system are mainly carried out following steps:
Step S110, from GPS receiver or Beidou receiver obtain k moment high ferro or aircraft longitude,Latitude and altitude information;
Step S120, calculates high ferro or aircraft according to the longitude of high ferro or aircraft, latitude and altitude informationWhen k, be engraved in the coordinate X of geocentric coordinate systemak、YakAnd Zak；
Step S130, is engraved in the coordinate X of geocentric coordinate system while calculating telecommunication satellite ksk、YskAnd Zsk；
Step S140, the coordinate X according to k moment high ferro or aircraft at geocentric coordinate systemak、YakAnd ZakWith the coordinate X of telecommunication satellite at geocentric coordinate systemsk、YskAnd ZskCalculate k moment high ferro or aircraft to logicalThe radius vector R of letter satellitek；
Step S150, utilizes calculus of finite differences, the radius vector R according to k moment high ferro or aircraft to telecommunication satellitekCalculate the radial velocity V of k moment high ferro or the relative telecommunication satellite of aircraft;
Step S160, through type (1-1) calculates the Doppler frequency Fd in k moment:
Fd＝(V/C)Fo(1-1)
Wherein, C is the light velocity, and Fo is signal center frequency; And
Step S170, is delivered to VSAT wideband satellite communication terminal by the Doppler frequency Fd in k moment.
Wherein, in step S120, calculate according to the longitude of high ferro or aircraft, latitude and altitude informationWhen high ferro or aircraft k, be engraved in the coordinate X of geocentric coordinate systemak、YakAnd ZakThrough type (1-2), formula (1-3)And formula (1-4) calculates:
Xak＝(ρ+Hk)cosφkcosλk(1-2)
Yak＝(ρ+Hk)cosφksinλk(1-3)
Zak＝((1-e2)ρ+Hk)sinφk(1-4)
Wherein, λkFor the longitude of k moment high ferro or aircraft, φkFor the latitude of k moment high ferro or aircraft,HkFor the height of k moment high ferro or aircraft, ρ is latitude φkThe radius of curvature of place's earth is through type(1-5) calculate:
ρ＝a/(1-e2sin2φk)1/2(1-5)
Wherein, a is the major radius of the corresponding ellipsoid of geocentric coordinate system, and e is the corresponding ellipsoid of geocentric coordinate systemThe first eccentricity.
In step S130, while calculating telecommunication satellite k, be engraved in the coordinate X of geocentric coordinate systemsk、YakWith ZskThat through type (1-6), formula (1-7) and formula (1-8) calculate:
Xsk＝(ρ+Hs)cosλ(1-6)
Ysk＝(ρ+Hs)sinλ(1-7)
Zsk＝0(1-8)
Wherein, HsFor telecommunication satellite is apart from the height of earth surface, be 36000 kms; λ is communicationThe longitude at satellite place, by satellite operations, business provides, also can for example, at literature query in the industry arbitrarily:For No. 7, Asia satellite, λ is that east longitude 105.5 is spent.
In step S140, the coordinate X according to k moment high ferro or aircraft at geocentric coordinate systemak、YakAnd ZakWith the coordinate X of telecommunication satellite at geocentric coordinate systemsk、YskAnd ZskCalculate k moment high ferro or flyMachine is to the radius vector R of telecommunication satellitekThat through type (1-9) calculates:
Rk＝((Xak-Xsk)2+(Yak-Ysk)2+(Zak)2)1/2(1-9)。
Step S150, utilizes calculus of finite differences, the radius vector R according to high ferro or aircraft to telecommunication satellitekCalculate kThe radial velocity V of moment high ferro or the relative telecommunication satellite of aircraft comprises:
Step S151, repeating step S110 to S140, calculates k+1 moment high ferro or aircraft to communicationThe radius vector R of satellitek+1; And
Step S152, through type (1-10) calculates the footpath of k moment high ferro or the relative telecommunication satellite of aircraftTo speed V: and
V＝(Rk+1-Rk)/T(1-10)
Wherein, T is the time difference in k+1 moment and k moment.
As shown in Figure 1, the present invention also comprises after step S110: step S110a, and to connecing from GPSThe navigation data that receipts machine or Beidou receiver obtain carries out dynamic analysis and filtering, and wherein filtering is to adoptBy the method for clean cut system Kalman filtering, so both can effectively reject random error, again can be correctWhat the disturbance of identification external dynamics caused jolts, thereby precisely realizes Doppler effect correction. The present invention is in stepBefore rapid S170, also comprise: step S170a, converts k moment Doppler frequency to VSAT broadband satelliteThe needed transformat of communication terminal.
VSAT wideband satellite communication terminal of the present invention is to hold with the LAN of server or embedded systemMouth connects, and GPS receiver or Beidou receiver are to be connected with the serial ports of server or embedded system.The present invention, after the said equipment is connected, carry out static debugging, to ensure that software can correctly connectReceive longitude, latitude and the altitude information of GPS receiver or Beidou receiver, and can correctly sendDoppler effect correction data. The present invention first can utilize automobile to obtain dynamic GPS or Big Dipper navigation data,Method is tested, and recycling SUAV is tested, and finally applies at high ferro or aircraftIn actual environment, test.
The present invention can apply for the Doppler Compensation Method of high ferro or aircraft VSAT wideband satellite communicationIn the VSAT wideband satellite communication environment of C-band, Ku wave band or Ka wave band, communication bandwidth canReach several million symbol rates, can meet high frequency and the requirement of large bandwidth to Doppler effect correction, its to high ferro andThe Doppler effect correction of aircraft can reach 10Hz.
Experiment one
The present invention uses No. 7, Asia satellite, and (fixed position is that east longitude 105.5 is spent, and tranmitting frequency is KuWave band, 14GHz), GPS receiver and VSAT wideband satellite communication terminal are placed on Beijing flies toIn the aircarrier aircraft in sea, using notebook computer as server, connect GPS receiver and VSAT broadbandSatellite communication terminal. Longitude, latitude and the altitude information of GPS receiver output aircraft practical flight trackTo notebook computer, the software that notebook computer operation is worked out according to Doppler Compensation Method of the present invention,The time interval of GPS output data is 1 second, and total data is recorded in notebook computer.
In aircraft flight process, in GPS receiver and notebook computer, mend according to Doppler of the present inventionThe software of compensation method establishment keeps operation, the aircraft GPS positional number that software obtains according to notebook computerFactually time, calculate Doppler frequency (offset data).
Above-mentioned all experiments were data preparation is plotted in Fig. 3, and Fig. 3 is the A330 being flown in Shanghai in BeijingType aircraft is at the schematic diagram in landing stage. Wherein, No. 1 curve is projection (of air speed on groundFace flying speed), unit: thousand ms/h; No. 2 curve is flying height, unit: rice; No. 4 songsLine is the aircraft that calculates by the method for the present invention radially speed with respect to Asia 7 signal communication satellitesDegree, unit: thousand ms/h; No. 5 curves are vector angles, unit: degree; No. 3 curves are to useDoppler frequency (compensation) curve that utilizes the inventive method to calculate, unit: hertz (Hz).Doppler frequency (compensation) curve bright by the summary analysis to all data, the present invention calculatesAccurate.
Experiment two
Fly to skyborne a certain position in the aircarrier aircraft practical flight in Shanghai taking Beijing as example (JiangsuEconomize near Wuxi City), inputoutput data of the present invention is as follows:
Input data:
Telecommunication satellite: No. 7, Asia satellite (fixed position is that east longitude 105.5 is spent)
Communication frequency: 14GHz
Aircraft position longitude: 120.3 degree
Aircraft position latitude: 31.6 degree
Aircraft position height: 4860 meters
Results of intermediate calculations:
Face velocity instantaneously: 715,000 ms/h
Vector angle: 138.5 degree
The radial velocity of aircraft to No. 7 satellites in Asia: 173,000 ms/h
Output data:
Doppler frequency: 2253Hz.
The above, be only preferred embodiment of the present invention, not the present invention made to any formOn restriction, although the present invention disclose as above with preferred embodiment, but not in order to limit thisBright, any those skilled in the art, are not departing within the scope of technical solution of the present invention, when can profitMake a little change or be modified to the equivalent embodiment of equivalent variations with the technology contents of above-mentioned announcement, butEvery technical solution of the present invention content that do not depart from, according to technical spirit of the present invention to above embodiment instituteAny simple modification, equivalent variations and the modification done, all still belong in the scope of technical solution of the present invention.
Claims (5)
1. for the Doppler Compensation Method of high ferro or aircraft VSAT wideband satellite communication, its featureBe: VSAT wideband satellite communication terminal is connected with server or embedded system, GPS is receivedMachine or Beidou receiver are connected with server or embedded system, and server or embedded system are carried outFollowing steps:
Obtain longitude, latitude and the height of k moment high ferro or aircraft from GPS receiver or Beidou receiverDegrees of data;
While calculating high ferro or aircraft k according to the longitude of high ferro or aircraft, latitude and altitude information, be engraved in groundThe coordinate X of heart coordinate systemak、YakAnd Zak；
While calculating telecommunication satellite k, be engraved in the coordinate X of geocentric coordinate systemsk、YskAnd Zsk；
Coordinate X according to k moment high ferro or aircraft at geocentric coordinate systemak、YakAnd ZakExist with telecommunication satelliteThe coordinate X of geocentric coordinate systemsk、YskAnd ZskCalculate k moment high ferro or the aircraft radius vector to telecommunication satelliteRk；
Utilize calculus of finite differences, the radius vector R according to k moment high ferro or aircraft to telecommunication satellitekCalculate the k momentThe radial velocity V of high ferro or the relative telecommunication satellite of aircraft;
Through type (1-1) calculates the Doppler frequency Fd in k moment:
Fd＝(V/C)Fo(1-1)
Wherein, C is the light velocity, and Fo is signal center frequency; And
The Doppler frequency Fd in k moment is delivered to VSAT wideband satellite communication terminal.
2. how general for high ferro or aircraft VSAT wideband satellite communication according to claim 1Strangle compensation method, it is characterized in that: obtaining k moment high ferro from GPS receiver or Beidou receiverOr also comprise after the longitude of aircraft, latitude and altitude information:
The navigation data obtaining from GPS receiver or Beidou receiver is carried out to dynamic analysis and filtering,Wherein filtering is the method that adopts clean cut system Kalman filtering.
3. how general for high ferro or aircraft VSAT wideband satellite communication according to claim 1Strangle compensation method, it is characterized in that: VSAT wideband satellite communication terminal via satellite channel connects in real timeThe dynamic frequency offset data that the satellite communication main website of receiving sends send server or embedded system to, doFor calibration and the recruitment evaluation of Doppler effect correction.
4. how general for high ferro or aircraft VSAT wideband satellite communication according to claim 1Strangle compensation method, it is characterized in that: adopt the timestamp in GPS receiver or Beidou receiver dataAs timing tool.
5. the Doppler for high ferro or aircraft VSAT wideband satellite communication according to claim 1Compensation method, is characterized in that: VSAT wideband satellite communication terminal is to be connected to server or embeddingThe LAN port of formula system, GPS receiver or Beidou receiver are to be connected to server or embedded systemThe serial ports of system.
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| CN109120561A (en) * | 2018-06-27 | 2019-01-01 | 东南大学 | LEO mobile satellite communication system intermediate frequency bias correcting method |
| CN109120561B (en) * | 2018-06-27 | 2021-03-02 | 东南大学 | Medium frequency offset correction method for low-orbit satellite mobile communication system |
| CN109560856A (en) * | 2018-11-23 | 2019-04-02 | 航天恒星科技有限公司 | A kind of Big Dipper short message Weapons Data catenary system suitable for severe flight dynamic environment |
| CN109560856B (en) * | 2018-11-23 | 2021-09-07 | 航天恒星科技有限公司 | Beidou short message weapon data chain system for severe flight dynamic environment |
| CN110943773A (en) * | 2019-11-26 | 2020-03-31 | 中国电子科技集团公司第五十四研究所 | Satellite broadcast demodulating equipment suitable for fixed wing aircraft platform |
| CN115051745A (en) * | 2022-05-09 | 2022-09-13 | 中国电子科技集团公司第二十九研究所 | Beidou short message inbound signal dynamic compensation method and device of high-speed spacecraft |
| CN115051745B (en) * | 2022-05-09 | 2024-01-26 | 中国电子科技集团公司第二十九研究所 | Beidou short message inbound signal dynamic compensation method and device for high-speed spacecraft |
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